Valve-level fault location method and system for conveters based on horizontal and vertical state differences of valves

Abstract

A valve-level fault location method and system for converters based on horizontal and vertical state differences of valves are disclosed. The method includes: collecting current data of a converter; calculating a time width of each valve conduction state, an alternating current conduction width, and a direct current conduction width based on the current data; constructing horizontal and vertical timing features on a circuit structure of the converter according to the alternating current conduction width and the direct current conduction width; comparing the time width of each valve conduction state with a time width of a normal valve conduction state, and outputting each valve state signal; and implementing valve-level fault location for the converter according to the time width of each valve conduction state, the alternating current conduction width, the direct current conduction width, the horizontal and vertical timing features, each valve state signal, and the current data. By constructing a difference between horizontal and vertical conduction widths of an alternating current and a direct current based on current timing features, valve-level faults of converters can be accurately located.